Let me try to understand what happened. You mailed a book to a person in the US from NZ with some NZ lottery tickets. Then you expect them to feel happy for receiving the (worthless in the US) lottery and frame the lottery tickets on their wall without scratching. And Pay for the return of their...
I'll try in helping you visualise gravity. :)
First, the basics. Gravity is a weak force, but has a long range. An electron, being such a small particle, still can exert its gravitational influence (albeit very weak) to the very end of the observable universe (if we had a sensitive enough...
I personally read any sentence which says physics won't be able to do something in the future, with the prefix "With physics as we understand today, *".
*"With physics as we understand today, you cannot see the planet as it is presently."
* "With physics as we understand today, we will...